Arch frame grabbing mechanism

Abstract

The present invention relates to the technical field of arch frame installation equipment, and specifically to an arch frame grasping mechanism including two groups of clamping jaw assemblies, a support platform and a driving unit; the two groups of clamping jaw assemblies are arranged along the length direction of the support platform, and are used to clamp the arch frame on the support platform; the clamping jaw assembly includes a connecting frame, a limit block, and two clamps arranged oppositely; the connecting frame is respectively hinged to the support platform, the driving unit, and the limit block; the two ends of the driving unit are respectively hinged to the connecting frames of the two groups of clamping jaw assemblies; when the driving unit is extended and retracted, it drives the connecting frame to rotate around a hinge point, thereby driving the limit block to move; the clamp is hinged to the support platform and connected to the limit block, and the clamp rotates around its hinge point as the limit block moves. The present invention can improve the compactness of the arch frame grasping mechanism and the stability of the grasping process.

Description

Technical Field

[0001] The invention relates to the technical field of arch frame installation equipment, and in particular to an arch frame grabbing mechanism. Background Art

[0002] During the installation of the tunnel arch frame, it is necessary to use a tunnel arch frame installation vehicle to grab and fix the arch frame, and then the construction workers will install the arch frame. In the traditional construction process, manual arch frame assembly or a single hoist is often used to grab the arch frame for installation. Manual installation is time-consuming and labor-intensive, with low construction efficiency and high personal safety risks; the single hoist installation mechanism has only one arch frame clamping position, and most arch frames are arc-shaped, which is easy to become unstable during the arch frame grabbing and lifting process, especially when multiple arch frames are prefabricated and erected. In addition, referring to the invention patent with application number CN106703844B, the clamping cylinder of the arch frame grabbing mechanism is generally arranged on the side of the supporting platform. The cylinder lacks protection during the change of clamping and loosening states, and the overall volume of the arch frame grabbing mechanism increases. It is easy to collide with other structures during operation, affecting the flexibility of the arch frame grabbing mechanism. Summary of the invention

[0003] In order to solve the above-mentioned technical problems, the present invention provides an arch frame grasping mechanism, which drives two groups of jaw assemblies to grasp synchronously through a driving unit, thereby improving the stability of the arch frame grasping, and by changing the direction of the force in space, the telescopic direction of the driving unit can be arranged along the length direction of the supporting platform, thereby improving the compactness of the arch frame grasping mechanism. The specific technical solution is as follows.

[0004] An arch frame grasping mechanism comprises two groups of jaw assemblies, a supporting platform and a driving unit; the two groups of jaw assemblies are arranged along the length direction of the supporting platform, and are used to clamp the arch frame on the supporting platform; the jaw assembly comprises a connecting frame, a limit block, and two relatively arranged clamps; the connecting frame is respectively hinged to the supporting platform, the driving unit, and the limit block; the two ends of the driving unit are respectively hinged to the connecting frames of the two groups of jaw assemblies; when the driving unit is extended or retracted, it drives the connecting frame to rotate around a hinge point, thereby driving the limit block to move; the clamp is hinged to the supporting platform and connected to the limit block, and the clamp rotates around its hinge point as the limit block moves.

[0005] Furthermore, two symmetrically arranged sliding grooves are provided in the limit block; the end of the clamp close to the limit block is connected to a limit pin; and the limit pins of the two clamps in the same group of clamping jaw assemblies are movably placed in the two sliding grooves respectively.

[0006] Furthermore, a limiting sleeve is rotatably sleeved on the limiting pin; and the limiting sleeve is movably placed in the sliding groove.

[0007] Furthermore, the symmetry center planes of the two chutes are the same as those of the two jaws.

[0008] Furthermore, an anti - detachment device is provided at one end of the limit pin away from the clamp, and the anti - detachment device is used to prevent the limit pin from sliding out of the chute.

[0009] Optionally, the drive unit is a unidirectional oil cylinder or a bidirectional oil cylinder.

[0010] Optionally, a pressing block is detachably connected to the clamping end of the clamp, and the pressing block is used to press the arch support.

[0011] Furthermore, the support platform includes a support portion and bending portions that bend downward along both sides of the support portion; the support portion and the bending portions enclose a receiving groove with an opening downward; the drive unit, the connecting frame, and the limit block are all arranged in the receiving groove.

[0012] Furthermore, a hinge bracket is provided on the outer side surface of the bending portion, and the clamp is hinged to the hinge bracket.

[0013] Furthermore, a "U" - shaped support frame is connected to the support portion.

[0014] Beneficial effects: An arch support grabbing mechanism provided by the present invention can change the direction of the force output by the drive unit in space through the connecting frame and the limit block, so that the telescopic direction of the drive unit can be arranged along the length direction of the support platform, reducing the volume of the grabbing mechanism, avoiding collision with other structures in the tunnel during the telescopic process of the drive unit, and improving the flexibility of the grabbing mechanism; and by connecting one drive unit to the connecting frames of two sets of jaw assemblies, the two sets of jaw assemblies can grab the arch support synchronously, avoiding the deviation of the arch support during the grabbing process due to asynchronous grabbing, and improving the stability of arch support grabbing. Description of the Drawings

[0015] Figure 1 is the overall structural schematic diagram of the arch support grabbing mechanism;

[0016] Figure 2 is one of the sectional views of the arch support grabbing mechanism along its length direction;

[0017] Figure 3 is Figure 2 one of the sectional views along the A - A plane in

[0018] Figure 4 is Figure 2 the second sectional view along the A - A plane in

[0019] Figure 5 is Figure 2 a partial sectional view along B - B in

[0020] Figure 6 is a schematic diagram of the structure of the clamp;

[0021] Figure 7 It is a schematic diagram of the pressing block pressing the arch flange plate;

[0022] Figure 8 It is a schematic diagram of the pressing block pressing the web of the arch frame;

[0023] Fig. 9 This is the second schematic cross-sectional view of the arch grabbing mechanism along its length direction.

[0024] Reference numerals: 1. clamping jaw assembly; 2. supporting platform; 3. driving unit; 4. arch frame;

[0025] 11. Connecting frame; 12. Limiting block; 13. Clamp; 14. First hinge point; 15. Second hinge point; 16. Third hinge point; 17. Fourth hinge point;

[0026] 121. Chute;

[0027] 131. Limit pin; 132. Limit sleeve; 133. Anti-slip device; 134. Press block;

[0028] 21. Supporting portion; 22. Bending portion; 23. Accommodating groove; 24. Articulated bracket; 25. Supporting frame;

[0029] 41. Flange plate; 42. Web plate. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Example

[0035] This embodiment provides an arch frame grabbing mechanism, which is used to grab the arch frame 4 during tunnel construction, so as to facilitate the construction personnel to install the arch frame 4. Figure 1 As shown, the arch frame 4 grasping mechanism includes two groups of clamping jaw assemblies 1, a support platform 2 and a driving unit 3. The two groups of clamping jaw assemblies 1 are arranged along the length direction of the support platform 2, that is, they are respectively located near the two ends of the support platform 2, and the arch frame 4 is clamped on the support platform 2 by the two groups of clamping jaw assemblies 1. Because the arch frame 4 is mostly arc-shaped, the two groups of clamping jaw assemblies 1 are respectively located near the two ends of the support platform 2 so that a certain distance is maintained between the two clamping positions, and the arch frame is not easy to become unstable when grasping, lifting, and arching.

[0036] Reference Figures 2 to 4 As shown, the clamp assembly 1 includes a connecting frame 11, a limit block 12 and two relatively symmetrically arranged clamps 13. Figure 2 As shown, the connecting frame 11 is hinged with the support platform 2 to form a first hinge point 14, the connecting frame 11 is hinged with the driving unit 3 to form a second hinge point 15, and the connecting frame 11 is hinged with the limit block 12 to form a third hinge point 16; the first hinge point 14, the second hinge point 15, and the third hinge point 16 can be set to a non-collinear triangle shape, or can be set to a collinear inclined state. The telescopic direction of the driving unit 3 is arranged along the length direction of the support platform 2, that is, the axis of the driving unit 3 is parallel to the length direction of the support platform 2, and the two ends of the driving unit 3 are respectively hinged with the connecting frames 11 of the two groups of clamping jaw assemblies 1. When the driving unit 3 is extended and retracted, the two connecting frames 11 are respectively driven to rotate around the first hinge point 14, thereby driving the limit block 12 to move according to the rotation trajectory of the second hinge point 15. The clamp 13 is hinged to the support platform 2 to form a fourth hinge point 17, and the clamp 13 is also connected to the limit block 12, and rotates around the fourth hinge point 17 as the limit block 12 moves, thereby achieving clamping and loosening actions.

[0037] In this embodiment, the direction of the force output by the drive unit 3 can be changed in space through the connecting frame 11 and the limit block 12, so that the extension and retraction direction of the drive unit 3 can be arranged along the length direction of the support platform 2, thereby reducing the volume of the grasping mechanism, avoiding collision between the drive unit 3 and other structures in the tunnel during the extension and retraction process, and improving the flexibility of the grasping mechanism; and by connecting one drive unit 3 with the connecting frame 11 of the two groups of clamping jaw assemblies 1, the two groups of clamping jaw assemblies 1 can synchronously grasp the arch frame 4, avoiding the arch frame 4 from being offset due to asynchronous grasping during the grasping process, and improving the stability of the grasping of the arch frame 4.

[0038] Specifically, refer to Figure 2 and Figure 3 As shown, two symmetrically arranged sliding grooves 121 are provided inside the limit block 12, and the sliding grooves 121 are waist-shaped holes or special-shaped holes, and the symmetry center planes of the two sliding grooves 121 are the same as the symmetry center planes of the two clamps 13; the end of the clamp 13 close to the limit block 12 is connected to a limit pin 131, and the limit pin 131 is perpendicular to the clamp 13 in the horizontal direction; the limit pins 131 of the two clamps 13 in the same group of jaw assemblies 1 are respectively movably placed in the two sliding grooves 121, specifically, the limit pin 131 can not only move relative to the limit block 12 along the length direction of the sliding groove 121, but also can move relative to the limit block 12 along the axial direction of the limit pin 131. When the driving unit 3 drives the limit block 12 to move along the rotation trajectory of the connecting frame 11, the limit block 12 drives the two clamps 13 to clamp or release synchronously, thereby realizing the synchronous action of the two clamps 13 in the same group of clamp assemblies 1, avoiding the deviation of the arch frame 4 from the center of the arch frame grasping mechanism after clamping due to the asynchrony of the clamps 13, and avoiding the problem that the clamps 13 on one side may push the arch frame 4 to contact the other side during the clamping process, causing the arch frame 4 to become unstable.

[0039] Specifically, the process of clamping the arch frame 4 using the clamping claw assembly 1 includes: Figure 2 As shown, the driving unit 3 is extended, and the connecting frame 11 is pushed to rotate counterclockwise, so that the limit block 12 moves toward the direction where the clamp 13 is located. Figure 3 As shown, the limit block 12 is moved in a direction away from the support platform 2. Since the clamp 13 is hinged to the support platform 2, the clamp 13 rotates around the fourth hinge point 17, and the two limit pins 131 move in the slide slot 121 and move away from each other until the clamp 13 clamps the arch 4. The final clamping state is as shown in FIG. Figure 4 shown.

[0040] The process of using the clamping jaw assembly 1 to loosen the arch frame 4 includes: referring to Figure 2As shown, the drive unit 3 is shortened, the connecting frame 11 is pulled clockwise, and the limit block 12 moves away from the clamp 13. Figure 4 As shown, the limit block 12 is moved toward the direction close to the support platform 2. Since the clamp 13 is hinged to the support platform 2, the clamp 13 rotates around the fourth hinge point 17, and the two limit pins 131 move in the slide slot 121 and approach each other until the limit block 12 abuts against the support platform 2. The state after relaxation is shown in FIG. Figure 3 shown.

[0041] As a further improvement of this embodiment, the limit pin 131 is rotatably sleeved with a limit sleeve 132, the limit sleeve 132 is preferably made of nylon, and the limit sleeve 132 is movably placed in the slide groove 121. During the clamping and loosening process of the jaw assembly 1, the limit sleeve 132 can avoid rigid friction between the limit pin 131 and the limit block 12, so that the limit pin 131 can move smoothly in the slide groove 121, and the service life of the limit pin 131 is extended.

[0042] As a further improvement of this embodiment, an anti-slip device 133 is provided at one end of the limit pin 131 away from the clamp 13. The size of the anti-slip device 133 is larger than the size of the slide slot 121. The anti-slip device 133 is used to prevent the limit pin 131 from slipping out of the slide slot 121. During the relative movement between the limit pin 131 and the limit block 12, the limit pin 131 not only moves relative to the length of the slide slot 121, but also moves relative to the axial direction of the limit pin 131. The anti-slip device 133 is provided to prevent the limit pin 131 and the limit block 12 from slipping out of the slide slot 121 when they move along the axial direction of the limit pin 131.

[0043] Optionally, in this embodiment, refer to Figure 2 As shown, the driving unit 3 can be a one-way oil cylinder, referring to Fig. 9 As shown, it can also be a bidirectional oil cylinder. During the extension and retraction process of the oil cylinder, the two clamping jaw assemblies 1 are synchronously driven to clamp or loosen.

[0044] Optionally, in this embodiment, the clamping end of the clamp 13 can be an integrated structure to directly clamp the arch 4, or can be connected to a detachable pressing block 134, see Figure 7 and Figure 8 As shown, replacing the pressing blocks 134 of different shapes can compress the flange plate 41 or the web plate 42 of the arch frame 4. Replacing the pressing blocks 134 of different shapes according to different structures of the arch frame 4 improves the applicability of grabbing the arch frame 4.

[0045] Specifically, refer to Figure 1 and Figure 2As shown, the support platform 2 includes a support portion 21 and bent portions 22 that are bent downward along both sides of the support portion 21; the support portion 21 and the bent portions 22 enclose a receiving groove 23 with an opening downward, and the driving unit 3, the connecting frame 11, and the limiting block 12 are all arranged in the receiving groove 23. The receiving groove 23 provides protection for the driving unit 3, the connecting frame 11, and the limiting block 12, avoiding collisions with these components during the operation of the arch grabbing mechanism, making the structure of the arch grabbing mechanism more compact, smaller in volume, and improving the flexibility during the operation.

[0046] Specifically, referring to Figure 1 As shown, a hinge bracket 24 is provided on the outer side of the bent portion 22, and the clamp 13 is hinged to the hinge bracket 24. Hinging the clamp 13 to the side of the support platform 2 further improves the compactness of the structure. The top end of the support portion 21 is connected with a "U"-shaped support frame 25, and the deflection of the arch 4 is restricted by the support frame 25, avoiding the arch 4 falling into the inner sides of the two clamps 13 due to operational errors during the placement or grabbing of the arch 4, and improving the reliability during the process of grabbing the arch 4.

[0047] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. An arch grabbing mechanism, characterized in that: It includes two groups of jaw assemblies, a support platform and a driving unit; the two groups of jaw assemblies are arranged along the length direction of the support platform and are used to clamp the arch frame on the support platform; the jaw assembly includes a connecting frame, a limiting block and two oppositely arranged clamping pliers; the connecting frame is respectively hinged to the support platform, the driving unit and the limiting block; both ends of the driving unit are respectively hinged to the connecting frames of the two groups of jaw assemblies; when the driving unit expands and contracts, it drives the connecting frame to rotate around a hinge point, thereby driving the limiting block to move; the clamping pliers are hinged to the support platform and connected to the limiting block, and the clamping pliers rotate around its hinge point as the limiting block moves. Two symmetrically arranged sliding grooves are provided in the limiting block; a limiting pin is connected to the end of the clamping plier close to the limiting block; the limiting pins of the two clamping pliers in the same group of jaw assemblies are respectively movably placed in the two sliding grooves; the limiting pin can not only move relative to the limiting block along the length direction of the sliding groove, but also move relative to the limiting block along the axis direction of the limiting pin.

2. The arch grabbing mechanism according to claim 1, characterized in that: A limiting sleeve is rotatably sleeved on the limiting pin; the limiting sleeve is movably placed in the sliding groove.

3. The arch grabbing mechanism according to claim 1, characterized in that: The symmetric center plane of the two sliding grooves is the same as the symmetric center plane of the two clamping pliers.

4. The arch grabbing mechanism according to claim 1, characterized in that: An anti-detachment device is provided at the end of the limiting pin away from the clamping plier, and the anti-detachment device is used to prevent the limiting pin from sliding out of the sliding groove.

5. The arch grabbing mechanism according to claim 1, characterized in that: The driving unit is a unidirectional oil cylinder or a bidirectional oil cylinder.

6. The arch grabbing mechanism according to claim 1, characterized in that: The clamping end of the clamping plier is detachably connected with a pressing block, and the pressing block is used to press the arch frame.

7. An arch grabbing mechanism according to any one of claims 1 to 6, characterized in that: The support platform includes a support part and a bending part bent downward along both sides of the support part; the support part and the bending part enclose a receiving groove with an opening downward; the driving unit, the connecting frame and the limiting block are all arranged in the receiving groove.

8. The arch grabbing mechanism according to claim 7, characterized in that: A hinge bracket is provided on the outer side surface of the bending part, and the clamping plier is hinged to the hinge bracket.

9. The arch grabbing mechanism according to claim 7, characterized in that: A "U"-shaped support frame is connected to the support part.

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